That anybody who has been banned might see it as a chance to re-fight old battles.

What every single person (and there aren't that many) in that banned category (as opposed to folks who just left the site because they found it wasn't really for them) has in common is that they have either (a) never accepted that anything they did was wrong, or (b) held their hands up on occasion to earn a 2nd (and 3rd, 4th, 5th etc) chance but in the end just carried on in their own sweet (incompatible with site standards) way.